Seem focal: $ uname -a Linux rpi-cm4-rev1d0-e428 5.4.0-1034-raspi #37-Ubuntu SMP PREEMPT Mon Apr 12 23:14:49 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux $ sudo dmesg | grep rtc [ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=0 bcm2708_fb.fbheight=0 bcm2708_fb.fbswap=1 smsc95xx.macaddr=DC:A6:32:D6:C8:D1 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 net.ifnames=0 dwc_otg.lpm_enable=0 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc console=tty1 console=ttyS0,115200 loglevel=8 quiet splash [ 1.974818] hctosys: unable to open rtc device (rtc0) [ 3.658840] rtc-pcf85063 10-0051: registered as rtc0
Seem focal: enable_ compat_ alsa=0 snd_bcm2835. enable_ hdmi=1 bcm2708_ fb.fbwidth= 0 bcm2708_ fb.fbheight= 0 bcm2708_fb.fbswap=1 smsc95xx. macaddr= DC:A6:32: D6:C8:D1 vc_mem. mem_base= 0x3ec00000 vc_mem. mem_size= 0x40000000 net.ifnames=0 dwc_otg. lpm_enable= 0 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc console=tty1 console= ttyS0,115200 loglevel=8 quiet splash
$ uname -a
Linux rpi-cm4-rev1d0-e428 5.4.0-1034-raspi #37-Ubuntu SMP PREEMPT Mon Apr 12 23:14:49 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux
$ sudo dmesg | grep rtc
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.
[ 1.974818] hctosys: unable to open rtc device (rtc0)
[ 3.658840] rtc-pcf85063 10-0051: registered as rtc0